Question

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In C# will the Finally block be executed in a try, catch, finally if an unhandled exception is thrown ?

Will finally be executed in this scenario (in C#)?

try
{
    // Do something.
}
catch
{
    // Rethrow the exception.
    throw;
}
finally
{
    // Will this part be executed?
}

Answer 1

Yes, finally is always executed.

A simple example for demonstrating the behaviour:

private void Button_Click(object sender, EventArgs e)
{
    try
    {
        ThrowingMethod();
    }
    catch
    { 
    }
}

private void ThrowingMethod()
{
    try
    {
        throw new InvalidOperationException("some exception");
    }
    catch
    {
        throw;
    }
    finally
    {
        MessageBox.Show("finally");
    }
}